429223 Block Polymer Membrane Adsorbers Chemically-Tailored for Selenium Sorption

Monday, November 9, 2015: 1:33 PM
155B (Salt Palace Convention Center)
Ryan Mulvenna1, Jacob Weidman2, Bryan W. Boudouris1 and William A. Phillip2, (1)School of Chemical Engineering, Purdue University, West Lafayette, IN, (2)Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN

Abstract: Traditionally, the targeted capture of analytes relies on packed beds for high-recovery and high-capacity sorption. Membrane adsorbers provide an alternative technological pathway that replaces microporous resins with high-flux membranes. However, these devices are stymied by low sorption capacities, complex processing methodologies, and have limited tunability. Here, we demonstrate the use of the self-assembly and non-solvent induced phase separation (SNIPS) technique to generate nanoporous thin films with tunable pore wall chemistries; in this way, chemically-selective membranes can be generated in a straightforward manner. Specifically, the A-B-C triblock polymer polyisoprene-b-polystyrene-b-poly(N,N-dimethylacrylamide) (PI-PS-PDMA) is processed from solution to yield a membrane with a pore density of ~1013 pores m-2. The PDMA moiety that lines the pore walls is converted, quantitatively, to thiol group chemical functionalities in the solid state using facile reaction conditions. These thiol-functionalized membranes act as high capacity, high flux adsorbers for the removal of selenium salts from an aqueous solution. This scalable system demonstrates a platform for high-flux chemically-selective purification for use in next-generation industrial water treatment and reuse applications.

Extended Abstract: File Not Uploaded
See more of this Session: Self-Assembled Soft Materials for Membrane Applications
See more of this Group/Topical: Separations Division